A4447

更新时间： 2024-09-17 06:35:07

品牌	Logo	应用领域
急速微 - ALLEGRO		稳压器
页数	文件大小	规格书
9页	320K
描述
High Voltage Step Down Regulator

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

A4447 数据手册

A4447

High Voltage Step Down Regulator

Features and Benefits

Description

▪ Wide input voltage range: 8 to 50 V

▪ Integrated low R_DS(on)DMOS switch

▪ 2 A continuous output current

▪ Adjustable fixed off-time

▪ Highly efficient

▪ Adjustable output: 0.8 to 24 V

▪ Small package with exposed thermal pad

The A4447 is a 2A, high efficiency general-purpose buck

regulatordesignedforawidevarietyofapplications.Theoutput

voltageisadjustablefrom0.8to24V,basedonaresistordivider

and the 0.8 V ±2% reference. External components include

an external clamping diode, inductor, and filter capacitor.

The off-time is determined by an external resistor to ground.

It operates in both continuous and discontinuous modes to

maintain light load regulation. An internal blanking circuit is

used to filter out transients due to the reverse recovery of the

external clamp diode. Typical blanking time is 200 ns.

This new device is ideal for various end products including

applications with 8 to 50 V input voltage range and require up

to 2 A output current, such as uninterruptible power supplies,

point of sale (POS) applications, and industrial applications

with 24 or 36 V bus.

Package: 8 pin SOIC with exposed thermal

pad (suffix LJ)

Applications include:

▪ Printer power supplies

▪ Office automation equipment

▪ POS thermal, laser, photo, and inkjet printers

▪ Tape drives

▪ Industrial applications

Approximate Scale 1:1

Typical Application

+42

CBOOT

0.01 μF

Efficiency vs. Output Current

CIN1

0.22 μF

CIN2

BOOT

ENB

VIN

3.3

L 1

V_OUT

A4447

1.8

1.5

3.3 V

2 A

TSET

GND

VBIAS

RTSET

54 k7

2.87 k7

ESR

V_OUT(V)

COUT

220 μF

25 V

CBYP

0.22 μF

910 7

500

1000

1500

2000

I_OUT(mA)

Data is for reference only. Efficiency data from circuit shown in left panel.

A4447-DS, Rev. 1

12 3 4 5 6 7...9

中文翻译

下载PDF

与A4447相关器件

型号	品牌	获取价格	描述	数据表
A4447_V	ALLEGRO	获取价格	High Voltage Step Down Regulator
A-44472-0254	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS Header, Dual Row, Vertical, without Snap-in Plastic Peg
A-44472-0257	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS™ Header, Du
A-44472-0451	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS Header, Dual Row, Vertical, with Snap-in Plastic Peg PCB
A-44472-0452	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS Header, Dual Row, Vertical, with Snap-in Plastic Peg PCB
A-44472-0454	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS™ Header, Du
A-44472-0457	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS Header, Dual Row, Vertical, without Snap-in Plastic Peg
A-44472-0653	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS™ Header, Du
A-44472-0654	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS Header, Dual Row, Vertical, without Snap-in Plastic Peg
A-44472-0853	MOLEX	获取价格	4.20mm (.165") Pitch Mini-Fit HCS Header, Dual Row, Vertical, with Snap-in Plastic Peg PCB